I just went to my osteopath yesterday for the same thing. He had to work alot on my shoulder because of ligament pains in the muscle, but also cracked my back and neck. He said my ribs were out again, ahhh the joys of pregnany, so I was quick to book in another appointment with him for two weeks time because I think I will be needing it. He said alot of his pregnant clients see him more frequently in the last 10 weeks because of the pressure of the baby on the spine and it puts alot of things out of wack.